J. Phys. IV France 09 (1999) Pr3-367-Pr3-372
Solar flash pyrolysis of biomass direct measurement of the optical properties of biomass componentsO. Boutin1, J. Lédé1, G. Olalde2 and A. Ferriere2
1 Laboratoire des Sciences du Génie Chimique, LSGC-CNRS-ENSIC-INPL, 1 rue Grandville, BP. 451, 54001 Nancy cedex, France
2 Institut de Science et de Génie des Matériaux et Procédés, IMP-CNRS, avenue du Pr. Trombe, BP. 5, Odeillo, 66125 Font-Romeu cedex, France
This paper reports some results of experiments made to determine optical properties of the components of biomass, mainly cellulose. Indeed, cellulose is a highly reflecting and weakly absorbing (semi transparent) material and in some experiments, a concentrated radiation is used (from solar furnaces for instance). The reflectivity is determined with a commercial reflectometer. About 85% of the incident flux is reflected by a pure cellulose pressed pellet. The subduing factor is determined with a specific experimental apparatus using optical fibers. For cellulose, about 80% of the flux which is not reflected by the surface of the pellet is absorbed after 10-3 m. This subduing factor can be well represented by an exponential law.
© EDP Sciences 1999